Abdolmohammadi Sanaz, Siyamak Samira, Ibrahim Nor Azowa, Yunus Wan Md Zin Wan, Rahman Mohamad Zaki Ab, Azizi Susan, Fatehi Asma
Department of Chemistry, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Department of Chemistry, Centre For Defence Foundation Studies, National Defence University of Malaysia, Sungai Besi Camp, 57000, Kuala Lumpur, Malaysia.
Int J Mol Sci. 2012;13(4):4508-4522. doi: 10.3390/ijms13044508. Epub 2012 Apr 10.
This study investigates the effects of calcium carbonate (CaCO(3)) nanoparticles on the mechanical and thermal properties and surface morphology of polycaprolactone (PCL)/chitosan nanocomposites. The nanocomposites of PCL/chitosan/CaCO(3) were prepared using a melt blending technique. Transmission electron microscopy (TEM) results indicate the average size of nanoparticles to be approximately 62 nm. Tensile measurement results show an increase in the tensile modulus with CaCO(3) nanoparticle loading. Tensile strength and elongation at break show gradual improvement with the addition of up to 1 wt% of nano-sized CaCO(3). Decreasing performance of these properties is observed for loading of more than 1 wt% of nano-sized CaCO(3). The thermal stability was best enhanced at 1 wt% of CaCO(3) nanoparticle loading. The fractured surface morphology of the PCL/chitosan blend becomes more stretched and homogeneous in PCL/chitosan/CaCO(3) nanocomposite. TEM micrograph displays good dispersion of CaCO(3) at lower nanoparticle loading within the matrix.
本研究考察了碳酸钙（CaCO₃）纳米颗粒对聚己内酯（PCL）/壳聚糖纳米复合材料的力学性能、热性能及表面形态的影响。采用熔融共混技术制备了PCL/壳聚糖/CaCO₃纳米复合材料。透射电子显微镜（TEM）结果表明，纳米颗粒的平均尺寸约为62 nm。拉伸测试结果显示，随着CaCO₃纳米颗粒负载量的增加，拉伸模量增大。添加高达1 wt%的纳米级CaCO₃时，拉伸强度和断裂伸长率逐渐提高。当纳米级CaCO₃的负载量超过1 wt%时，这些性能出现下降。在CaCO₃纳米颗粒负载量为1 wt%时，热稳定性得到最佳增强。PCL/壳聚糖共混物的断裂表面形态在PCL/壳聚糖/CaCO₃纳米复合材料中变得更加舒展和均匀。TEM显微照片显示，在较低的纳米颗粒负载量下，CaCO₃在基体中分散良好。
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